79 KZ650 carb rebuild question

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11 Oct 2005 14:25 #754 by medic24
79 KZ650 carb rebuild question was created by medic24
Have thoroughly "ibbyized" my carbs and I am wondering what is the recommended position for the air screws? ie how many turns out????
Thanks
Dave

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11 Oct 2005 14:32 #755 by medic24
Replied by medic24 on topic 79 KZ650 carb rebuild question
Sorry, I didn't know we now had a carb forum

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11 Oct 2005 14:50 #759 by GargantuChet
Replied by GargantuChet on topic 79 KZ650 carb rebuild question
Clymer recommends 1 1/8 turns out as a starting point. I just did mine this weekend, with help from a friend.

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13 Oct 2005 18:46 #1506 by Idaho_Spud
Replied by Idaho_Spud on topic 79 KZ650 carb rebuild question
I just adjusted the air mixture screws on my 1979 KZ650 B3. The owner's manual calls for you to seat them lightly, then open them 1 5/8 turns.

They were running pretty rich before this adjustment - the exhaust smelled like half-burnt gasoline, and it backfired when I backed off the throttle. Since making this adjustment, no stinky exhaust, and no backfires either.

Hope this helps!

Post edited by: Idaho_Spud, at: 2005/10/13 21:47

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13 Oct 2005 19:29 #1527 by GargantuChet
Replied by GargantuChet on topic 79 KZ650 carb rebuild question
Hmm... Page 142 of my Clymer manual says:

"21. On pilot screw models, turn pilot screw in carefully until it seats lightly, then back it out 1 1/8 turns. Install the limiter onto the pilot screw with tab pointing towards the front (Figure 25)." (emphasis and italics theirs)

I might be unclear about what everyone is calling air screws. This is the screw on the bottom of the carb, towards the front (from Figure 25 on page 142).

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13 Oct 2005 20:06 #1546 by DanOz7Five0
Replied by DanOz7Five0 on topic 79 KZ650 carb rebuild question
GargantuChet wrote:

Hmm... Page 142 of my Clymer manual says:

"21. On pilot screw models, turn pilot screw in carefully until it seats lightly, then back it out 1 1/8 turns. Install the limiter onto the pilot screw with tab pointing towards the front (Figure 25)." (emphasis and italics theirs)

I might be unclear about what everyone is calling air screws. This is the screw on the bottom of the carb, towards the front (from Figure 25 on page 142).


There can be 2 different sets of screws. If your screws are on the bottom of the carbs tucked in by the float bowls, those would be called idle FUEL screws. If you have screws above the bowls in the main carb body those would be called idle AIR screws. The pic below shows where air screws are located.

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13 Oct 2005 21:08 #1574 by GargantuChet
Replied by GargantuChet on topic 79 KZ650 carb rebuild question
Thanks for clarifying! It seems that many terms are often used for the same part (pilot screws vs. fuel screws, for instance), and it's sometimes confusing. I really appreciate the picture, as I don't think my carbs have the air screws.

Thumbs up to ye! B)

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14 Oct 2005 02:32 #1618 by Idaho_Spud
Replied by Idaho_Spud on topic 79 KZ650 carb rebuild question
Yep thanks! Those are the screws that I tweaked a bit.

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